Income Taxes - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Dec. 22, 2017	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Income (loss) before income taxes		$ (40,293)	$ 40,926	$ 10,338	$ (62,395)	$ (833,600)	$ (98,908)	$ (88,375)	$ (37,331)	$ (51,424)	$ (1,058,214)	$ (410,400)
Tax expense recorded from Tax Cuts and Jobs Act	$ 17,000
Net operating loss carryforward		33,771				20,559				33,771	20,559	10,720
Amount that tax basis of net assets is less than reported amounts		1,200,000				$ 1,400,000				1,200,000	1,400,000	1,700,000
UK
Operating Loss Carryforwards [Line Items]
Income (loss) before income taxes											11,000	4,000
TRS
Operating Loss Carryforwards [Line Items]
Income (loss) before income taxes										100,000	$ 59,000	$ 58,000
Net operating loss carryforward		134,000								134,000
Net operating loss carryforwards subject to expiration		22,000								22,000
Net operating loss carryforwards not subject to expiration		$ 112,000								$ 112,000